General Information
Created for a certain type of XRT owner, and while we don't know you, this one's for the hooligans.
Direct Power:
The DP in the model number means this servo requires Direct Power. Anyway, this means it uses a 2S-4S pack. While we have them in capacities ranging from 650mAh to 6000mAh, the most popular pack is the B4S2500 and if you want one, then remember to add it to your order. Or select it from the pull-down menu under Power Options. Anyway, whether you buy a pack from us, or not, just so you know, the 2500 is the most popular size, and it uses an XT30 - keep this in mind.
Also, if you have other ideas for powering it, like maybe using a stand-alone BEC, perhaps a Castle Creations CC BEC 2.0 or similar (we have these, also), it's unlikely to have the stones to run the servo at full power.
Or if in the alternative, you're thinking of just tying into the propulsion pack, instead (maybe by tapping into two cells via the balance connector), then please be aware ripple (electronic noise) due to the motor/ESC (as it varies throttle position) will backfeed into the circuit (on the servo) and damage a component on the PCB. We're expressly warning against doing this so you know in advance that repair cost won't be covered by warranty. Not trying to be an asshat, but also don't want this to become a problem, so heads up, eh?